Polymeric humidity sensors with nonlinear response: Properties and mechanism investigation
Polymeric humidity sensors with nonlinear response: Properties and mechanism investigation
复制标题
具有非线性响应的聚合物湿度传感器：特性和机理研究
DOI：
10.1002/app.39400
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发表时间：
2013-11-05
影响因子：
3
通讯作者：
Zhang, Tong
中科院分区：
文献类型：
--
作者：
Fei, Teng;Zhao, Hongran;Zhang, Tong
研究了基于几种亲水性聚合物[聚N-乙烯-2-吡咯烷酮(PVP)、聚乙烯醇(PVA)和羟乙基纤维素(HEC)]的具有开关特性的湿度传感器。这些聚合物被选为传感材料，因为分子中的极性基团(酰胺、羟基和醚键)可以与水分子相互作用。在交流电压作用下，传感器对相对湿度(RH)均表现出非线性响应。传感器的阻抗在低相对湿度下几乎保持不变，在一定湿度下急剧下降(对于PVP、PVA和HEC传感器，分别约为75%、65%和55%RH)。传感器的开关点和灵敏度可以通过改变工作频率、聚合物掺杂或掺杂亲水性材料来调节。传感器的复阻抗表明，在低相对湿度下，电子贡献占主导地位，离子对提高相对湿度有很大的贡献。聚合物的不同传感性能归因于它们在高相对湿度下不同的亲水性和离子贡献。©2013威利期刊公司J.应用。波兰姆。SCI。130：2056-2061,2013
A class of humidity sensors with switching property based on several hydrophilic polymers [poly(N-vinyl-2-pyrrolidone) (PVP), poly(vinyl alcohol) (PVA), and hydroxyethyl cellulose (HEC)] were researched. These polymers were selected as the sensing materials because the polar groups in the molecules (amide, hydroxyl, and ether bond) could interact with water molecules. The sensors all show nonlinear response to relative humidity (RH) under AC voltage. The impedances of the sensors remain almost unchanged at low RH and decrease sharply at certain humidity (about 75, 65, and 55% RH for PVP, PVA, and HEC sensors, respectively). The switching points and sensitivities of the sensors could be adjusted by changing the operating frequency, polymer blending, or doping with hydrophilic materials. The complex impedances of the sensors demonstrate that the electronic contribution is dominant at low RH, and the ions make a significant contribution for increasing RH levels. The different sensing properties of the polymers are attributed to their different hydrophilic properties and ionic contributions at high RH. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 2056–2061, 2013